DAYTONA BEACH, Fla. — Republicans’ frustration with Donald Trump has reached new heights, with party leaders scrambling to persuade their presidential nominee to abandon divisive tactics that have triggered sinking poll numbers and low morale.

Party chairman Reince Priebus is appealing to the New York billionaire’s adult children to help amid new signs of a campaign in trouble.

Trump’s operation has been beset by internal discord, including growing concern about general election preparedness and a lack of support from Republican leaders, according to two people familiar with the organization’s inner workings.

One of the people said Trump privately blames his own staff for failing to quiet the backlash from his own party after he criticized an American Muslim family whose son, a U.S. Army captain, was killed in Iraq.

The inner tension comes as Priebus and handful of high-profile Trump allies consider whether to confront the candidate directly to encourage a new approach following a series of startling stances and statements. In the midst of the uproar over his continued criticism of the Khan family, Trump infuriated Priebus and other party leaders by refusing to endorse GOP House Speaker Paul Ryan’s re-election.